Patent GB-190503822-A (GB)
Title: Improvements in Apparatus for Governing Engines Driven by Steam from Different Sources at Different Pressures.
Inventor: RATEAU AUGUSTE CAMILLE EDMOND
Filed: 1905-02-23
Granted: 1905-05-04
Abstract: 3822. Rateau, A. C. E. March 2, 1904, [date applied for under Patents Act, 1901]. Governing an d regulating speed and power.-A method of governing engines and turbines which receive steam from different sources, or from sources at different pressures, is described. A high and a low pressure engine are mounted to drive the same shaft The low-pressure engine exhausts into a condenser, and the high-pressure engine may exhaust either into the low-pressure engine or into a condenser. With the arrangement described, wheu the steam from the low-pressure source decreases or increases in pressure, the low-pressure engine throttle must close or open and the high-pressure throttle open or close to a corresponding extent, these operations being independent of the governor, which may be of any type. The low-pressure throttle is shown at 5 and the high-pressure throttle at 6, Fig. 1. These valves, which are shown in section in Fig. 3, are actuated by levers 10, 8, which together with the link 18, attached to the piston 20, are connected by links 11, 12 to a pin which is moved by the governor 17 through the agency of a rod 13 and bell-crank lever 14, 15. The space in the cylinder 21 below the piston 20 is connected to the lowpressure source of steam, and the upper side of the piston is loaded by a spring 22. Assuming the piston 20 to be at the top of its stroke, it will be found that the low-pressure throttle has been further opened and the low-pressure throttle closed to a corresponding extent. If, then, the pressure below the piston 20 falls, the pistonwill descend and bring the ends 26 nearer each other, the effect being to close the throttle of the low-pressure and open that of the high-pressure source. The limiting pressures in the low-pressure source are fixed by the stiffness of the spring 22. The movements described above will not affect the governor 17, which moves both valves always in the same direction. Instead of the levers 10, 8 being connected by two links as in Fig. 1, a single straight link may be used as shown in Fig. 4. This link consists of cylinders 31, 32 of the type shown in Fig. 1, mounted on a hollow rod 33 into which steam from the low-pressure source is admitted by a flexible tube 34. The length of this link therefore depends on the steam pressure in the pipe 33. Instead of the piston 20, Fig. 1, a flexible diaphragm of india-rubber or metal may be used. Motors of a more complex nature may be combined to drive one shaft, in which the high-pressure motor is supplied from boilers working at different pressures and is provided with two or more throttle valves which open and close together. In the case where the combined engines drive a fan or pump, the speed-regulating device may consist of a piston or diaphragm acted upon by the delivery pressure and balanced at the normal speed by a spring or counterweight. The throttle valves 5, 6 consist of a piston valve 1 sliding in a chamber 2 provided with ports 3 through which steam passes from the pipe 4.